$\frac{1-\sin^2\left(x\right)+\sin^2\left(x\right)}{\sin\left(x\right)}$

$\frac{10x^2y^2-8y^3+6y}{2y^2}$

$\frac{d^3}{dx^3}\:2x^4$

$\left(-5x+1\right)\left(-5x+4\right)$

$\int\frac{3x^2-x+4}{x\left(x^3+2x^2+x\right)}dx$

$\frac{3x+1}{4}-\frac{1}{3}\le\frac{2}{15}\left(3x+2\right)+\frac{4\left(1-x\right)}{3}$

$\frac{5x^2+41x+43}{x+7}$